F4 ratio estimation confirms Nordic admixture in Amerindians

I ran the F4 ratio estimation program from ADMIXTOOLS on the HGDP Amerindian populations to see how the results would compare with those from ADMIXTURE and DIYDodecad.

Referring to the phylogeny for F4 ratio estimation below, I used San for the O population, Dai for the C population, Orcadians for the B population, Sardinians for the A population, and Amerindians for the X populations.

The results are below. The Nordic admixture proportions are in the alpha column, and are expressed as fractions of 1, not as percentages.